sh: Make the atomic functions safe for irqsoff tracing

The irqsoff tracer uses the atomic_* functions internally, but the
implementations of those functions in arch/sh/include/asm/atomic-irq.h
disable irqs to achieve atomicity. A continuous loop ensues where we
disable interrupts, trace the interrupt disabling, call atomic_*
functions, disable interrupts, trace the interrupt disabling, etc..

The simplest solution to all this is to just convert uses of
local_irq_save()/local_irq_restore() the raw_* equivalents because the
raw_* equivalents don't call trace_hardirqs_on()/trace_hardirqs_off().

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/include/asm/atomic-irq.h b/arch/sh/include/asm/atomic-irq.h
index a0b3480..467d941 100644 (file)
--- a/arch/sh/include/asm/atomic-irq.h
+++ b/arch/sh/include/asm/atomic-irq.h
@@ -10,29 +10,29 @@ static inline void atomic_add(int i, atomic_t *v)
 {
        unsigned long flags;
 
-       local_irq_save(flags);
+       raw_local_irq_save(flags);
        v->counter += i;
-       local_irq_restore(flags);
+       raw_local_irq_restore(flags);
 }
 
 static inline void atomic_sub(int i, atomic_t *v)
 {
        unsigned long flags;
 
-       local_irq_save(flags);
+       raw_local_irq_save(flags);
        v->counter -= i;
-       local_irq_restore(flags);
+       raw_local_irq_restore(flags);
 }
 
 static inline int atomic_add_return(int i, atomic_t *v)
 {
        unsigned long temp, flags;
 
-       local_irq_save(flags);
+       raw_local_irq_save(flags);
        temp = v->counter;
        temp += i;
        v->counter = temp;
-       local_irq_restore(flags);
+       raw_local_irq_restore(flags);
 
        return temp;
 }
@@ -41,11 +41,11 @@ static inline int atomic_sub_return(int i, atomic_t *v)
 {
        unsigned long temp, flags;
 
-       local_irq_save(flags);
+       raw_local_irq_save(flags);
        temp = v->counter;
        temp -= i;
        v->counter = temp;
-       local_irq_restore(flags);
+       raw_local_irq_restore(flags);
 
        return temp;
 }
@@ -54,18 +54,18 @@ static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
 {
        unsigned long flags;
 
-       local_irq_save(flags);
+       raw_local_irq_save(flags);
        v->counter &= ~mask;
-       local_irq_restore(flags);
+       raw_local_irq_restore(flags);
 }
 
 static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
 {
        unsigned long flags;
 
-       local_irq_save(flags);
+       raw_local_irq_save(flags);
        v->counter |= mask;
-       local_irq_restore(flags);
+       raw_local_irq_restore(flags);
 }
 
 #endif /* __ASM_SH_ATOMIC_IRQ_H */